public class Example4_19 {
  public static void main(String args[]) {
     Student zhang=new Student(); 
     Student geng=new Student();  
     zhang.setAge(23); 
     System.out.println("zhang的年龄："+zhang.getAge()); 
     geng.setAge(25);    
     System.out.println("geng的年龄："+geng.getAge());  
    }
}





